a) x – 345 094 = 123 357

x = 123 357 + 345 094

x = 468 451

b) x : 13 = 125

x = 125 x 13 

x = 1625

a: =>x=123357+345094=468451

b: =>x=125x13=1625

\(a,x-345094=123357\\ \Rightarrow x=123357+345094\\ \Rightarrow x=468451\\ b,x:13=125\\ \Rightarrow x=125\times13\\ \Rightarrow x=1625\)

= (-123) x (-25) - 123 x 89 + 123 x 89 - 123 x 125

= 123 x 25 - 123 x 89 + 123 x 89 - 123 x 125

= 123 x (25  - 125) - (123 x 89 - 123 x 89)

= 123 x (-100) - 0

= -12 300

a) \(x+365=10x+730\)

\(x-10x=730-365\)

\(-9x=365\)

\(x=-\frac{365}{9}\)

vay \(x=\frac{-365}{9}\)

b) \(x+125=125+15x\)

\(x-15x=125-125\)

\(-14x=0\)

\(x=0\)

vay \(x=0\)

cau (c) vo nghiem 

cau(a) Ix(x-4)I=x

x>=0

Ix(x-4)I=x.Ix-4I=x

x =0 la nghiem

x khac 0 chia hai ve cho x

Ix-4I=1

x-4=+-1

x=3 hoac x=5

mik thấy câu c hơi  vô lí

còn câu a = 5

câu b mik ko biết

123+x+2x=2x+345-236

<=>x+2x-2x=345-236-123

<=>x=-14

vậy x=-14

1324+x+x=125-2x-3x

<=>x+x-2x-3x=125-1324

<=>-3x=-1199

<=>x=\(\frac{1999}{3}\)

vậy x=\(\frac{1999}{3}\)

k mk nha mấy bạn

\(123+x+2x=2x+345-236\)

\(\Leftrightarrow2x+345-236-2x-x=123\)

\(\Leftrightarrow109-x=123\)

\(\Leftrightarrow x=-14\)

a) x – 123 = 345                                                         b) x + 254 = 665

         x      = 345 + 123                                                    x          = 665 – 254

         x      =  468                                                                x       = 211

=345*(123-23)=345*100=34500

345x123-345x23

=345x(123-23)

=345x100

=34500

345 x 123 - 345 x 23

= 345 x ( 123 - 23 )

= 345 x 100

= 34500

246+X=1000

X=1000-246

X=754

Đáp án bằng 754 nhé!

123 x2+X=1000

246+X=1000

X=1000-246

X= 754

tích nha thank nhiều